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在线等差数列求和计算器
source link: https://segmentfault.com/a/1190000040992363
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在线等差数列求和计算器
本工具可以计算一个等差数列前N项之和，输入等差数列的首项，公差以及需要求和的项数，工具将会根据等差数列求和公式Sn=n(a1+an)/2自动计算前N项和。 若相关参数变动，求和结果将会实时更新。
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